/Engine/Plugins/Enterprise/DatasmithImporter/Source/DatasmithImporter/Public/Utility/DatasmithImporterUtils.h
Add a layer to the world if there is no other layer with the same name
static void AddUniqueLayersToWorld ( [UWorld](API\Runtime\Engine\Engine\UWorld) * World, const [TSet](API\Runtime\Core\Containers\TSet)< [FName](API\Runtime\Core\UObject\FName) > & LayerNames )